Control power supply system for NPC three-level converter
A technology for power supply system and control power supply, which is applied in the direction of control/regulation system, regulation of electrical variables, emergency power supply arrangement, etc., can solve the problem of inability to meet the low-cost control power supply demand of NPC three-level converters
Active Publication Date: 2021-02-12
江苏国科智能电气有限公司 +1
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Problems solved by technology
The current technology cannot meet the low-cost control power supply requirements of NPC three-level converters
Method used
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[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0030] The typical topology of the NPC three-level converter applying the present invention is as follows figure 1 As shown, the control power supply system of the present invention passes through the high-voltage positive terminal X HP , High voltage zero terminal X HO , High voltage negative terminal X HN From figure 1 The DC bus of the NPC three-level converter shown is powered, and the high-voltage positive terminal X HP Connect to the positive bus of the NPC three-level converter, such as figure 1 Medium 100, high voltage zero terminal X HO Connect to the zero bus of the NPC three-level converter, such as figure 1 Middle 101, high voltage negative terminal X HN Connect to the negative bus of the NPC three-level converter, such as figure 1 Middle 102. The control power supply system through the X LP 、X LO The terminal outputs 24V...
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The invention discloses a control power supply system for an NPC three-level converter. The system comprises a main circuit and a control unit. The main circuit adopts a full-bridge double-push-pull isolation type DC / DC topology and is composed of a high-voltage side circuit, an isolation transformer and a low-voltage side circuit. The isolation transformer is of a common-iron-core four-winding structure; a first winding and second winding of a high-voltage side are connected to form a push-pull structure; a third winding and fourth winding of a low-voltage side are connected to form a push-pull structure. A high-voltage side of the main circuit takes power from a positive bus, a zero bus and a negative bus of the NPC three-level converter through XHP, XHO and XHN terminals respectively; AC ends of two bridge arms of a full-bridge circuit are connected with a first winding head end X11 and a second winding tail end X22 of the isolation transformer respectively; a series connection point X121 of the two windings of the high-voltage side is connected to a neutral point NO; the control unit comprises four links, namely, voltage closed-loop control, sawtooth wave generation, first-stage PWM generation and second-stage PWM conditioning distribution; the G1G4 and G2G3 interval switch periods Ts of the full-bridge circuit are alternately switched on at the duty ratio D through control, and power supply energy conversion and output voltage control are achieved.
Description
technical field [0001] The invention relates to an NPC three-level converter control power supply system. Background technique [0002] Wind power generation, photovoltaic power generation and other new energy generation methods based on wind energy and solar energy utilization are effective ways to solve future energy problems. However, wind energy and solar energy have the characteristics of intermittency, volatility, and randomness, and an energy storage system with a certain capacity is required to solve the grid active power balance problem caused by large-scale new energy grid-connected power generation. The converter is the key equipment in wind power generation, photovoltaic power generation and energy storage systems, and plays a decisive role in satisfying the adaptability of the grid. The neutral point clamped three-level converter based on the diode clamped three-level topology The device can reduce the material cost of the system to a certain extent, and has be...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02M7/487H02M3/337H02J9/06
CPCH02M7/487H02M3/3376H02J9/062
Inventor 吕佃顺武鑫王立鹏冯莉马强赵世雄张彦欢汪浩赵栋利
Owner 江苏国科智能电气有限公司